Nobody here has mentioned the fact that their are two SSD technologies. SLC and MLC (single layer cell & multi layer cell).
SLC drives are more expensive, but faster and much more reliable. One of the reasons they cost more is that SLC NAND chips are lower density, which means larger/more chips.
Most SSDs for sale seem to be MLC, which are slower and much less reliable. I have used both. Having recently put a SLC based SSD in my laptop, I can report that the resulting performance boost on the drive, which obviously also serves as the boot drive, is night and day.
Keep in mind though that SSDs aren't a silver bullet. Sustained sequential writes are actually significantly slower on an SSD vs a traditional magnetic platter drive. For that reason, even if they get bigger and cheaper, I would not use one to record audio to.